JPH0560737U - Automatic screw tightener - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify and reduce the size of the XY table used. [Configuration] The driver 5 is rotationally driven by a driver rotational drive motor 6. The driver 5 and the driver rotation drive motor 6 are driven up and down, but do not move horizontally and are fixed in position. XY table 1 below the driver 5
0 is placed. XY table 1 when tightening screws
A work (screwed object) 11 is mounted on a horizontal moving table 13 of 0. The XY table 10 moves the work 11 in two directions at right angles X and Y in a horizontal plane, and positions a specific screw tightening position directly below the driver 5. Since the XY table merely holds the work, the structure is simplified and miniaturized. Since the driver 5 is fixed, the force applied to the XY table for holding the work at the time of screw tightening is always at the same place, and the XY table is simplified and downsized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic screw tightener that automatically performs screw tightening work on a workpiece (body to be screw-fastened).

[0002]

[Prior Art]

 A conventional general automatic screw tightener fixes a work on a workbench, holds an electric screwdriver on a movable part of an XY table arranged above it, and moves the electric screwdriver in the XY directions. The configuration is such that the screw is tightened at a predetermined position on the work.

As another conventional automatic screw tightening machine, a work is provided so as to be movable in the Y direction, and an electric driver is provided so as to be movable in the X direction. The work is moved in the Y direction and the electric driver is moved in the X direction. In some cases, the work of tightening screws at predetermined locations on the work is performed.

[0004]

[Problems to be solved by the device]

 In the method using the XY table, the XY table has a complicated structure and a large size because the structure of the XY table is such that it holds an electric driver that requires rotational drive and vertical drive to move in the XY directions. And the overall structure of the automatic screw tightener will be enlarged. In addition, the rotating electric driver moves in the XY directions, which is not preferable in terms of safety.

Further, in the method of moving the electric work in the Y direction and the electric screwdriver in the X direction, since the screw tightening operation is different from the human sense, first, a large number of screws are sequentially arranged. Teaching operation to remember the tightening work is not easy. Moreover, since the electric screwdriver is configured to move in one axis direction, the moving mechanism of the electric driver is still larger than that of an XY table that moves in two axis directions, and as a result, the entire automatic screw tightening machine is as described above. There is also a problem that the structure becomes large.

The present invention has been made to solve the above-mentioned conventional drawbacks, and provides an automatic screw tightening machine which can simplify and downsize the structure of an XY table and has high safety. The purpose is to

[0007]

[Means for Solving the Problems]

 An automatic screw tightener of the present invention that solves the above problems is provided with a vertical automatic driver that is movable only in the vertical direction, and a workpiece that is held below the automatic driver and that moves in two directions perpendicular to the horizontal plane. And an XY table that allows

[0008]

[Action]

 In the above configuration, the work is held on the XY table and moves in the XY directions, and the specific screw tightening location is located directly below the automatic driver. Then, the automatic driver descends to perform screw tightening work on the specific screw tightening point.

Although a reaction force at the time of screw tightening acts on the screw tightening place on the work, since the position of the automatic driver is fixed, the force applied to the XY table holding the work at the time of screw tightening is always the same. Become. Therefore, the rigidity of the XY table is smaller than that when an automatic driver is provided on the XY table.

Further, only one (only the work) is moved in the X-Y direction, and the screw tightening operation is common to human senses. Therefore, the teaching operation for memorizing the work of tightening a large number of screws in order at first is easy.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of an automatic screw tightener according to an embodiment of the present invention, and FIG. 2 is a side view of the same. Reference numeral 1 indicates an automatic screw tightener. An electric driver device support base 3 is fixed to an upper part of a machine frame 2 of the automatic screw tightener 1, and an electric driver device 4 is attached to the electric driver support base 3. The electric driver device 4 includes a vertical driver 5, a driver rotary drive motor 6 for rotationally driving the driver 5, a chuck 7 for gripping a screw provided at the tip of the driver 5, the driver 5 and the driver drive motor 6 part as one body. It is composed of a driver elevating and lowering drive motor 8 and the like for vertically elevating. A screw supply hose 9 of a screw supply device (not shown) is connected to the chuck 7. During the screw tightening operation, screws are supplied one by one to the chuck 7 by the screw supply hose 9, and the tip of the driver 5 engages with the head of the screw while the screw is gripped by the chuck 7.

An XY table 10 is arranged below the driver 5. As shown in detail in FIGS. 3 and 4, the XY table 10 includes a vertical moving table 12 that moves in the X direction (front-back direction when viewed from the front) and a Y direction (when viewed from the front) on the vertical moving table 12. A horizontal moving table 13 that moves in the left-right direction), and a work mounting jig 14 that holds the work 11 is mounted on the horizontal moving table 13 during work. The vertical moving base 12 is configured such that a slide portion 16 provided integrally on the back surface is fitted to a vertical moving rail 15 provided on the base portion 2b of the machine frame 2 so as to be guided in the X direction. Further, a ball nut 17 is fixed to a bracket 12a which is integrated with the vertical moving table 12, and a screw 18 screwed to the ball nut 17 is provided in parallel with the vertical moving rail 15 to vertically drive the screw 18. A drive motor (using a pulse motor) 19 is installed on a mounting base 31 fixed on the base 2b of the machine frame 2.

A slide portion 22 that is long in the Y direction is fixed to the back surface of the horizontal moving table 13, and a guide member 23 that guides the slide portion 22 in the Y direction is fixed to the upper surface of the vertical moving table 12. A rack 24 extending in the Y direction is fixed to the rear surface of the lateral movement table 13, and a pinion 25 is engaged with the rack 24. The pinion 25 is rotatably attached to an attachment base 32 fixed on the base 2b of the machine frame 2, and a lateral drive motor (using a pulse motor) 26 also fixed to the attachment base 32 is provided between the pulleys 27 and 28. It is adapted to be rotationally driven via a timing belt 29 that is wound around.

Next, the operation will be described. The screw tightening work in the illustrated example is a work for fixing the printed circuit board to the chassis or case with a screw, and the work (that is, the printed circuit board and the chassis or case to which the printed circuit board is to be mounted) 11 is mounted on the lateral movement base 13 of the XY table 10. The work mounting jig 14 holding the is fixed. The work 11 has screw tightening points at a plurality of points. When tightening a screw at a specific screw tightening place, the XY table 10 is operated to position the screw tightening place just below the driver 5. That is, the vertical drive motor 19 is operated to rotate the screw 18, and the vertical moving table 12 is moved by a predetermined distance in the X direction integrally with the ball nut 17 with which the screw 18 is screwed, and the horizontal moving The motor 26 is operated to rotationally drive the pinion 25 via the timing belt 29, and the lateral moving table 13 is moved via the rack 24 in the Y direction by a predetermined distance. Next, the driver elevating drive motor 8 is operated to integrally lower the driver 5 and the driver rotation drive motor 6, and the driver 5 drives the screw supplied from an unillustrated screw supply hose and grasped by the chuck 7. The rotary drive motor 6 is driven to rotate and the screw is tightened to the work 11.

When the screw tightening work is performed at one location by the above-described operation, the driver 5 and the driver rotation drive motor 6 are lifted, and then the XY table 10 is memorized by the pre-teaching operation. The next screw tightening point on the work 11 is located immediately below the driver 5, and then the driver 5 tightens the screw by the same operation as above. This operation is repeated for all screw tightening points on the work 11.

Although the electric driver is used as the automatic driver in the embodiment, the present invention is not limited to this, and may be, for example, an air driven type. In short, the position is fixed and the automatic driver can only move up and down. Further, the structure of the XY table is not limited to that of the embodiment, and in short, it is sufficient that the work can be held and moved in two directions at right angles to XY.

Further, in the embodiment, the case where the printed circuit board is fastened and fixed to the chassis, the case or the like with the screw has been described, but the present invention is not limited to this and can be applied to various screw tightening operations.

[0018]

[Effect of the device]

 According to the present invention, the XY table can be moved in the XY directions while holding a simple work that is neither driven to rotate nor moved up and down, thereby simplifying the structure of the XY table.

The reaction force at the time of screw tightening acts on the screw tightening place on the work, but since the position of the automatic driver is fixed, the force applied to the XY table holding the work at the time of screw tightening is always the same place. Therefore, the rigidity of the XY table is smaller than that in the case where an automatic driver is provided on the XY table, and the configuration of the XY table is also simplified and downsized in this respect. In addition, safety is improved because the position of the rotating automatic driver is fixed.

Further, unlike the conventional method in which the work is moved in the Y direction and the automatic driver is moved in the X direction, only one (only the work) is moved in the XY direction, and the screw tightening operation is common to human senses. Therefore, the teaching operation that remembers the work of tightening a large number of screws in order first is easy.

[Brief description of drawings]

FIG. 1 is a front view of an automatic screw tightener showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

3 is an enlarged plan view showing an XY table portion in FIG. 1. FIG.

FIG. 4 is an enlarged side view of an XY table portion in FIG.

[Explanation of symbols]

 1 Automatic Screw Tightening Machine 4 Electric Driver Device 5 Driver 6 Driver Rotation Drive Motor 7 Chuck 8 Driver Elevation Drive Motor 10 XY Table 11 Work 12 Vertical Moving Platform 13 Horizontal Moving Platform 14 Work Mounting Jig 15 Vertical Moving Rail 16 Sliding Part 18 Screw 19 Vertical drive motor 22 Slide part 23 Guide member 24 Rack 25 Pinion 26 Horizontal drive motor 29 Timing belt

Claims (1)

[Scope of utility model registration request] 1. A vertical automatic driver provided so as to be movable only in a vertical direction, and an XY table for holding a work below the automatic driver and moving it in two directions at right angles in a horizontal plane. And automatic screw tightening machine.